Chemical and photochemical water oxidation catalyzed by novel ruthenium complexes comprising a negatively charged NCNHCO ligand. Issue 2 (21st December 2016)

• Record Type: Journal Article
• Authors: Su, Wei; Younus, Hussein A.; Zhou, Kui; Khattak, Zafar A. K.; Chaemcheun, Somboon; Chen, Cheng; Verpoort, Francis
• Is Part Of: Catalysis science & technology. Volume 7:Issue 2(2017)
• Page Start: 387
• Page End: 395
• Publication Date: 2016-12-21
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/c6cy02333a
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : Pincer-type ruthenium complexes incorporating an asymmetric negatively charged imidazolylidene were prepared and capable to oxidize water chemically and photo-chemically with high stability. Abstract : Incorporation of negatively charged moieties into complexes is a promising strategy to develop water oxidation catalysts with high stability and low over-potentials. We reported here the synthesis of a novel pincer-type ligand precursor, 1-(pyridin-2-ylmethyl)-3-methylcarboxylate-imidazolium (1 ). Deprotonation of C2-H of1 resulted in formation of NC NHC O, a negatively charged asymmetric N-heterocyclic carbene (NHC). Complexes [Ru(NC NHC O)(terpy)] + (2 ) and RuCl(NC NHC O)(DMSO)(pic) (3 ) were prepared and capable of decomposing water chemically and photo-chemically. Under acidic conditions, 4-picoline/H2 O exchange in3 was detected by UV-vis and 1 H NMR, forming the corresponding Ru–aqua complex. In a typical three-component light-induced water oxidation, a turnover number of 273 was attained employing3, which demonstrated catalytic ability comparable to those state-of-the-art catalysts.